An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction ...An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction and zinc precipitation were evaluated.The single-factor experimental results showed that the removal rates of Zn2+and24SO?decreased with an increased ZPT concentration ranging from3.0to5.0mg/L.Zn2+and24SO?in wastewater were effectively removed under the conditions of30?35°C,pH7?8and an inoculum concentration of10%?25%.The presence of Fe0in the SRB system enhanced Zn2+and24SO?removal and may increase the resistance of SRB to the toxicity of Zn2+and ZPT in wastewater.A Box?Behnken design was used to evaluate the influence of the main operating parameters on the removal rate of24SO?.The optimum parameter values were found to be pH7.45,33.61°C and ZPT concentration of0.62mg/L,and the removal rate of24SO?reached a maximum of91.62%under these optimum conditions.展开更多
It has been more than one century since the activated sludge process was invented.Despite its proven stability and reliability,the energy(especially the electrical energy)use in wastewater treatment should evolve to m...It has been more than one century since the activated sludge process was invented.Despite its proven stability and reliability,the energy(especially the electrical energy)use in wastewater treatment should evolve to meet the increasingly urgent demand of energy efficiency.This paper discusses how the energy utilized in conventional biological wastewater treatment can be altered by switching the indirect energy input to a direct electricity injection,which is achieved by the elecfrode integration providing extra thermodynamic driving force to biodegradation.By using electrodes instead of oxygen as terminal electron acceptors,the electrical energy can be utilized more efficiently,and the key of direct use of electrical energy in biodegradation is the development of highly active electroactive biofilm and the increase of electron transfer between microbes and the electrode.Furthermore,the synergy of different microbial electrochemical units has additional benefit in energy and resource recovery,making wastewater treatment more sustainable.展开更多
基金Project(2015DFG92750)supported by the International S&T Cooperation Program of ChinaProjects(51278464,51478172)supported by the National Natural Science Foundation of ChinaProject(2014GK1012)supported by the Department of Science and Technology of Hunan Province,China
文摘An enriched and domesticated bacteria consortium of sulfate-reducing bacteria(SRB)was used to treat wastewater from zinc pyrithione(ZPT)production,and the effects of different reaction parameters on sulfate reduction and zinc precipitation were evaluated.The single-factor experimental results showed that the removal rates of Zn2+and24SO?decreased with an increased ZPT concentration ranging from3.0to5.0mg/L.Zn2+and24SO?in wastewater were effectively removed under the conditions of30?35°C,pH7?8and an inoculum concentration of10%?25%.The presence of Fe0in the SRB system enhanced Zn2+and24SO?removal and may increase the resistance of SRB to the toxicity of Zn2+and ZPT in wastewater.A Box?Behnken design was used to evaluate the influence of the main operating parameters on the removal rate of24SO?.The optimum parameter values were found to be pH7.45,33.61°C and ZPT concentration of0.62mg/L,and the removal rate of24SO?reached a maximum of91.62%under these optimum conditions.
基金This work was financially supported by National Natural Science Foundation of China(No.51922051)the Fund for Distinguished Young Scholars of Tianjin(20JCJQJC00040).
文摘It has been more than one century since the activated sludge process was invented.Despite its proven stability and reliability,the energy(especially the electrical energy)use in wastewater treatment should evolve to meet the increasingly urgent demand of energy efficiency.This paper discusses how the energy utilized in conventional biological wastewater treatment can be altered by switching the indirect energy input to a direct electricity injection,which is achieved by the elecfrode integration providing extra thermodynamic driving force to biodegradation.By using electrodes instead of oxygen as terminal electron acceptors,the electrical energy can be utilized more efficiently,and the key of direct use of electrical energy in biodegradation is the development of highly active electroactive biofilm and the increase of electron transfer between microbes and the electrode.Furthermore,the synergy of different microbial electrochemical units has additional benefit in energy and resource recovery,making wastewater treatment more sustainable.
